简易计算器

#include<iostream>
using namespace std;
int main()
{
    int x,y;
    char r;
    cin>>x>>y>>r;
    if(y==0 && int(r)==int('/')){
        cout<<"Divided by zero!"<<endl;
    }
    else{
    switch(int(r)){
        case int('+'):
            cout<<x+y<<endl;
            break;
        case int('-'):
            cout<<x-y<<endl;
            break;
        case int('*'):
            cout<<x*y<<endl;
            break;
        case int('/'):
            cout<<x/y<<endl;
            break;
        default:
            cout<<"Invalid operator!"<<endl;
    }
    }
    return 0;
}